OAKLAND — A man was killed and two teenage boys wounded Tuesday night in a shooting behind an East Oakland recreation center, police said.

Police have not ruled out the possibility the shooting was gang-related, said Officer Jason Andersen, the case's lead investigator.

An Alameda County coroner's spokesman identified the man who was killed as Juan Carlos Betancourt, a 20-year-old Oakland resident.

The names of the two teenagers, 13 and 15, both of Oakland, were not released. They were in hospitals this morning and were expected to recover.

The shooting happened about 9:45 p.m. behind the Rainbow Recreation Center at 5800 International Blvd., police said. The center was closed when the shooting happened.

The three shooting victims and some other men were standing just inside the rear entrance to the field portion of the complex talking when multiple gunmen walked up and began shooting, Andersen said.

"Nothing was said. They just started shooting," Andersen said. The suspects ran away, and police were seeking them today, he added.

The man was hit several times and pronounced dead at the scene. The teenagers were each hit more than once. No one else was injured.

The killing was Oakland's 67th homicide of the year. Last year at this time there were 86 homicides.

Police and Crime Stoppers of Oakland are offering up to $20,000 in reward money for information leading to the arrest of the suspects. Anyone